Rheostat.



No. 738,392. PATENTED SEPT. 8, 1903. W. V. ASH.

RHEOSTAT.

APPLICATION FILED JAN. 2, 1903.

I0 MODEL. 2 SHEETS-SHEET 1 WITNESSES: INVENT R (wo 4mm BL? W182i 6TTQRNEY ITO- 738,392. PATBNTED SEPT. 8, 1903.

W. V. ASH.

RHEOSTAT.

APPLICATION IILED JAN. 2, 1903.

I N0 MODEL; 2 SHEETS-SHEET 2.

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Patented September 8, 1903.

\VALTER V. ASH, OF PERTH AMBOY, NEW JERSEY.

RHEOSTAT.

spncrrrcnrron forming part of Letters Patent No. 738,392, datedSeptember s, 1902.

Application filed January 2, 1903. Serial No. 137,522. (No model.)

To all whom it may concern.-

Be it known that I, TVALTER V. ASH, a citizen of the United States ofAmerica, an d a resident of Perth Amboy, in the county of Middlesex andState of New Jersey, have i11- vented certain new and usefulImprovements in Rhcostats, of which the following is a specification. v

My invention relates to a rheostat adapted to employ the sameresistances for regulating the speed of the motor that are used forincluding and cutting out the current of the armature of said motor, andaccordingly the device considered as a whole is a compound rheostat.

Generically the invention consists of a set of resistances incombination with amain line for furnishing an electric current to drivean electric motor having the fields in shunt to the armature of themotor, means for includ ing said resistances in circuit with saidarmature and then gradually cutting out said resistances from saidarmature, a magnet for holding said means at its maximum limit of motionwhen all the resistances are cut out, said magnet being so related tosaid means that it releases said means when either too weak or toostrong by an overload on the motor, and a manual device for includingand regulating the number of resistances in circuit with saidfield-magnet after they have been cut out of the armature-circuit bysaid means.

My invention consists specifically of rheostat resistances adapted to beincluded in the circuit of the armature of a shunt-motor in series withone another and to be successively and finally all cut out from saidcircuit by a handle turned against the action of a spring which tends toreturn said handle to its nor-. mal phase, an iron armature carried bysaid arm, a magnet for said iron armature gov-.

ances that were cut out of the armature-circuit by the other handle.

Figure 1 is a plan, partly in diagram, of the complete organizationcomprising the invention. One of the handles is in the normal phase an dthe other in an abnormal position. Fig. 2 is a side view of a portion ofthe apparatus as looked at from the left of Fig. 1. Fig. 3 is a sideview of the apparatus as looked at from the right hand of Fig. 1,with.the more distant parts omitted. Fig. at shows the pivot and spring.

The apparatus is composed particularly of the resistances 1, connectinthe contactplates 2 in the usual manner Ior connecting said resistancesin series with one another. Some of the plates, as shown at 2, arepreferably placed on an arc of smaller radius than the plates 2 for thepurpose of making the device narrower. These resistances are adapted tobe included in circuit with the armature 3 of the motor, whosefield-magnet is indicated at i. The device for including theseresistances 1 in said circuit and for cutting them out again from saidcircuit is the contactpiece 5, carried on the handle 6, pivoted on thepivot 7 and resisted by the action of a coil-spring 8,Which tends toreturn the handle 6 to its normal position against the stop A. Afterthehandle 6 has been pushed to the extreme left to secure the closing ofthe armature and the exclusion of the resistances 1 said handle is to beheld in that extreme position independently of the operators hands. Forthis reason the iron armature 10 is provided on the handle 6 to comeagainst the poles 11 and 12 of the magnet 13, which is in the form of asolenoid having the core 14. The solenoid 13 is in the same circuit withthe armature 3, as the handle 6, which is electrically connected to thecontact-plate 5, so that the current can pass to said contact from thebinding-post 15. Therefore the magnet 13 is energized to the maximumwhen the armature 10 is pushed against the pole-pieces 11 and 12.However, if the load on the motor varies so as to weaken the attractingpower of the magnet 13 the armature 10 is released and the handle 6 isquickly returned to its normal position by the action of the spring 8.Means are provided also for returning this handle to its normal positionif the load is so heavy that the core 14 is abnormally attracted,

for then the circuit-closer 16, carried by the core 14,comes in contactwith the terminals 18 of the magnet 13 and short-circuits the latter,thereby similarly releasing the handle (3, and the spring 19, beingprovided for the circuitcloser 16, returns it to its normal position,away from the terminals 18.

The handle 20 is for varying the speed of the motorby including the sameresistances 1 or excluding some of them from the circuit of thefield-magnet, and said handle 20 is carried by the same pivot 7, therebysecuring means for using the same resistances 1 both for starting andstopping the motor and for varying the speed of the motor. The contactplate on the handle 20 is number 21. The cur: rent is from the positivepole of the dynamo 22 through the hand-switch 23, to the-binding-post15, through the handle 20, through one or more resistances 1, accordingto the position of the handle 20, then to the contact plate 2 at theextreme right, then through the field-magnet coil 4, and back to thenegative pole of the dynamo. Thereby the movement of the handle 20 willvary the number of resistances of the resistance-coil 1, in circuit withthe field-magnet coils of the motor, for varying the speed of the motor.

The complete operation is as follows: The handle 6 is turned by handuntil the armature 10 is held by the pole-pieces 11 and 12, the switch23 having been closed by hand to begin with. The motor then runs, withthe full current possible, through the field-magnet. The speed may bevaried by turning the han dle 20 back and forth over the contacts 2 and2. If the load becomes too great, the magnet 13 is short-circuited andthe handle 6 is released from the solenoid, or if the load is too littlethe handle is automatically released. The spring 8 has nothing to dowith the action of the handle 20, which is merely pivoted.

and adapted to remain on any contact 2 or 2 when the operators hand isremoved, but is returned by the recoil of the handle 6.

I claim as my invention 1. The combination of resistances in seriescircuit With each other, main-line conductors, armature of a motor,field-magnet of the motor, means for including said resistances incircuit with the armature, and then gradually cutting out saidresistances from the armature, a magnet included in the armature-ci.rcuit for holding said means, at the position where the resistances arecut out, for substantially only a normal load upon said motor, and amanual device for independently including and regulating the number ofsaid resistances in circuit with said field, after they have been cutout of the armature-circuit by said means.

2. The combination of resistances in series circuit with each other,main-line conductors,

armature of a motor, field-magnet of the mo tor, means for includingsaid resistances in circuit with the armature, and then graduallycutting out said resistances from the armature, a magnet included in thearmature-circuit for holding said means, at the position where theresistances are cut out, for substantially only a normal load upon saidmotor, and a manual device for independently including and regulatingthe number of said resistances in circuit with said field, after theyhave been cut out of the armature-circuit by said means, said meanscarrying an iron armature to be attracted and held by said magnet at apredetermined load on the motor and to be released when the loaddecreases.

3. The combination of resistances in series circuit with each other,mainline conductors, armature of a motor, field-magnet of the motor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded in the armature-circuit for holding said means, at the positionWhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, saidmeans carrying an iron armature to be attracted and held by saidmagnet'at a predetermined load on the motor and to be released when theload decreases, and a spring for returning said means and device whenreleased by said magnet.

4. The combination of resistancesin series circuit witheach other,main-line conductors, armature of a motor, field-magnet of the m otor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded in the armature-circuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregnlating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, saidmeans carrying an iron armature to be attracted and held by said magnetat a predetermined load on the motor and to be released when the loaddecreases, a spring for V returning said means when released by saidmagnet, and a handle on said means.

5. The combination of resistances in series circuit with each other,main-line conductors, armature of a motor, field-magnet of the motor,means for including said resistances in circuit with the armature, an dthen gradually cutting out said resistances from the armature, a magnetincluded in the armature-circuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means,

determined load on the motor and to be re leased when the loaddecreases, a spring for returning said means when released by saidmagnet, a handle on said means, and a circuitcloser governed by thecurrent of said magnet for short-circuiting saidmagnet when theload onthe motor is greater than a predetermined amount.

6. The combination of resistances in series circuitwith each other,main-line conductors, armature of a motor, field-magnet of the motor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded in the armature-circuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, anda circuit-closer governed by the current of said magnet forshort-circuiting said magnet when the load on the motor is greater thana predetermined amount.

7. The combination of resistances in series circuit with each other,main-line conductors, armature of a motor, field-magnet of the motor,means for including said resistances in (circuit with the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded in the armature-circuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, saidmeans carrying an iron armature to be attracted and held by said magnetat a predetermined load on the motor and to be released when the loaddecreases, and a circuitcloser governed by the current of said magnetfor short-circuiting said magnetwhen'the load on the motoris greaterthan a predetermined amount.

8. The combination of resistances in series circuit with each other,main-line conductors, armature of a motor, field magnet of. the motor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded in the armaturecircuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, saidmeans carrying an iron armature to be attracted and held by said magnetat a predetermined load on the motor and to be released when the loaddecreases, a spring for returning said means when released by saidmagnet, and a circuit-closer governed by the current of said magnetforshort-circuiting said magnet when the load on the motor is greater thanapredetermined amount.

9. The combination of resistances in series circuit with each other,main-line conductors, armature of a motor, fieldmagnet of the motor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the armature, amagnetincluded in the armaturecircuit for holding said means, at theposition where the resistances are cut out, for substantially only anormal load upon said motor, a manual device for independently including and regulating the number of said resistances in circuit with saidfield, after they havebeen cutout of the armature-circuit by said means,said means carrying an iron armature to be attracted and held by saidmagnet at a predetermined load on the motor and to be released when theload decreases, a spring for returning said means when released by saidmagnet,a handle on said means, and a circuit-closer governed by thecurrent of said magnet for short-circuiting said magnet when the load onthe motor is greaterth an a predetermined amount.

10. The combination of resistances in series circuit with each other,main-line conductors, armature of a motor, field-magnet of the motor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded in the armaturecircuit for holding said means at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, saidmeans carrying an iron ar mature to be attracted andheld by said magnetfor returning said means when released by said magnet, and acircuit-closer governed by the current of said magnet forshortcircuiting said magnet when the load on the motor is greater than apredetermined amount, and a spring normally holding said circuit-closeropen.

11. The combination of resistances in series circuit with each other,main-line conductors, armature of a motor, field magnet of the motor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the ar mature, a magnetincluded in the armaturecircuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, saidmeans carrying an iron armature to be attracted and held by said magnetat a predetermined load on the motor and to be released When the loaddecreases, and a spring for returning said means when released by saidmagnet, a handle on said means, a circuit-closer governed by the currentofsaid magnet for short-circuiting said magnet when the load on themotor is greater than a predetermined amount, and a spring normallyholding said circuit-closer open.

12. The combination of resistances in series circuit with each other,main-line conductors, armature of a motor, field magnet of the motor,means for including said resistances in circuit with the armature, andthen gradually cutting outsaid resistances from the armature, a magnetincluded in the armaturecircuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, anda single pivot for saidmeans and for said device to turn upon.

13. The combination of resistances in series circuit with each other, inain-line conductors, armature of a motor, field magnet of the motor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded in the armaturecircuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cutout of the armaturecircuit by said means, saidmeans carrying an iron armature to be attracted and held by said magnetat a predetermined load on the motor and to be released When the loaddecreases, a spring for returning said means when released by saidmagnet, and a single pivot for said means and for said device to turnupon, said magnet being in the form of a solenoid with polepieces, anarmature for said pole-pieces'carried by said means, a core for saidsolenoid, a circuit-closer carried bysaid core, terminals for thesolenoid adapted to be closed by said circuit-closer forshort-circuiting said magnet, anda spring for holding said circuitcloseropen.

14. The combination of resistances in series circuit with each other,main-line conductors, armature of a motor, field-magnet of the mo. tor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded in the armature-circuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, saidmeans carrying an iron armature to be attracted and held by said magnetat a predetermined load on the motor and to be released when the loaddecreases, a spring for returning said means when released by saidmagnet, a handle on said means, and a single pivot for said means andfor said device to turn upon.

15. The combination of resistancesin series circuit With each other,main-line conductors, armature of a motor, field-magnet of the motor,means for including said resistances in circuit with the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded. in the armature-circuit for holding said means, at theposition where the resistances are cut out, for substantially only anormal load upon said motor, a manual device for independently includingand regulating the number of said resistances in circuit with saidfield, after they have been cut out of the armature-circuit by saidmeans, said magnet being in the form of a solenoid with pole-pieces, anarmature for said pole pieces carried by said means, a core tor saidsolenoid, a circuitcloser carried by said core, terminals for thesolenoid adapted to be closed by said circuitcloser for short-eircuitingsaid magnet, and a spring for holding said circuit-closer open.

16. The combination of resistances in series circuit with each other,main-line conductors, armature of a motor, field-magnet of the motor,means for including said resistances in circuit With the armature, andthen gradually cutting out said resistances from the armature, a magnetincluded in the armature-circuit for holding said means, at the positionwhere the resistances are cut out, for substantially only a normal loadupon said motor, a manual device for independently including andregulating the number of said resistances in circuit with said field,after they have been cut out of the armature-circuit by said means, asingle pivot for said means and for said device to turn upon, saidmagnet being in the form of a solenoid with pole-pieces, an armature forsaid pole-pieces carried by said means, a core for said solenoid, acircuit-closer carried by said solenoid, terminals for the solenoidadapted to be closed by said circuit-closer for short-circuiting saidmagnet, and a spring for holding said circuit-closer open.

In testimony whereof I have hereunto sub scribed my name and affixed myseal this 19th day of December, 1902.

WALTER V. ASH. [L. s]

Vitnesses H. O. BIsHoP, CHARLES W. THIcKsrUN.

